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Financial Risk Management Activities (Schedule Providing Credit Risk From Others, Net Of Collateral) (Detail) - Power [Member] $ in Millions | Jun. 30, 2017 USD ($) Counterparty
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Derivative [Line Items] |  |
Current Exposure | $ 429 |
Securities held as Collateral | 92 |
Net exposure | 337 |
Number of Counterparties greater than 10% | 1 |
Amount Of Net Credit Exposure Greater Than Ten Percent | $ 130 |
Number Of Active Counterparties On Credit Risk Derivatives | Counterparty | 152 |
Investment Grade [Member] |  |
Derivative [Line Items] |  |
Current Exposure | $ 420 |
Securities held as Collateral | 92 |
Net exposure | 328 |
Number of Counterparties greater than 10% | 1 |
Amount Of Net Credit Exposure Greater Than Ten Percent | 130 | [1]
Non-Investment Grade [Member] |  |
Derivative [Line Items] |  |
Current Exposure | 9 |
Securities held as Collateral | 0 |
Net exposure | 9 |
Number of Counterparties greater than 10% | 0 |
Amount Of Net Credit Exposure Greater Than Ten Percent | 0 |
Letter of Credit [Member] |  |
Derivative [Line Items] |  |
Securities held as Collateral | $ 92 |
[1] | Represents net exposure of $130 million with PSE&G.

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